A Novel Permutation Spreading for MIMO-CDMA Based on STBC

Abstract

CDMA is one of the channelization protocols that support more number of users simultaneously and asynchronously. It uses spreading technique that spreads information bearing signals, so that only intended receiver can able to receive it thus provides security. Here proposed a novel method is for designing the spreading permutations based on STBC (space time block code) matrices for MIMO-CDMA systems. The performance of the two techniques for MIMO-CDMA systems operating on frequency-flat slowly Rayleigh fading channels are compared and it was proved and achieved to obtain less BER compared with MIMO-CDMA with less system complexity.